5.
The “jetting” stage is well known in cratering physics …but this may represent the first ever appeal to jetting in an attempt to explain an actual geological feature on the face of the Earth. 15-cm Ball of Marine Chalk Found in an Upland Depression (Sliced Cross Section) Note “toasted” exterior and shattered (brecciated) interior. My Model for the Jetting-Phase: The Ocean – and the Soft Coastal Deposits – Are Chamfered at an Angle of ~0.06 o Present day slope of the base of the “upland deposits” Jetting-Induced Debris Flows

6.
“ Upland Deposits”  R -3 4,300 km 3 (Poag, 1997) It is known from explosion experiments that the thicknesses of ejecta blankets follow the -3 rd power of the radius R from the crater center. The normalization factor is determined from the total volume of ejecta, which in turn can be scaled from the known diameter of the crater. About Ten Minutes after Impact 0.06 ° Bacons Castle fm.

7.
H.J. Melosh, Impact Cratering – A Geologic Process (Oxford University Press, New York, 1989)  J.N. Head, H.J. Melosh, B.A. Ivanov Science 298 (2002) 1752  The fastest interference-zone ejecta can leave with ~0.5 times the speed v i of the impacting object! ~2.0 Impactor Diameters Interference-Zone Ejecta But let us drop back to the first few tenths of a second… ~0.02 v i

8.
But let us drop back to the first few tenths of a second…  GRANITE Vertical Exaggeration X 50 Distance (km) Chesapeake Bay Crater 10 min “ Effective” Interference Zone ( v  0.02 v i ) Frye (1986) found this granite “dropstone” in a mudstone bed 800 km due west of the crater center. 27-kg granite object found among the “upland gravels” 200 km northwest of the crater center (speaker’s front yard). Lower Limit of Interference Zone USGS

10.
CALVERT I “ The Day After” About 500,000 Years Later 35.5 Ma Chickahominy Fm. CALVERT II “ Exmore Breccia” Glass ~35.0 Ma About Two Million Years Later Present The two Calverts are diachronous in anyone’s model. In my model Calverts I and II are diachronous across the time plane of just 2 millon years. In the canonical model Calvert II rests on a formation supposedly ~28 m.y. older! However, materials deposited on the crater floor ca. 8 Ma should have been removed by fluvial erosion during the low stands of the Quaternary. N.B. The fossils in Calverts I and II are neritic species. Lower Eocene clays ??? ??? ~8 Ma